// 布尔值
let isDone: boolean = false

// 数字
let decLiteral: number = 6
// hex
let hex: number = 0xf00d
// 二进制
let binary: number = 0b1010
// 八进制
let octal: number = 0o744

// 字符串
let names: string = `abc`

let __undefined: undefined = undefined

let __null: null = null